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/* Machine independent support for SVR4 /proc (process file system) for GDB.
Copyright (C) 1999-2016 Free Software Foundation, Inc.
Written by Michael Snyder at Cygnus Solutions.
Based on work by Fred Fish, Stu Grossman, Geoff Noer, and others.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "infrun.h"
#include "target.h"
#include "gdbcore.h"
#include "elf-bfd.h" /* for elfcore_write_* */
#include "gdbcmd.h"
#include "gdbthread.h"
#include "regcache.h"
#include "inf-child.h"
#include "filestuff.h"
#if defined (NEW_PROC_API)
#define _STRUCTURED_PROC 1 /* Should be done by configure script. */
#endif
#include <sys/procfs.h>
#ifdef HAVE_SYS_FAULT_H
#include <sys/fault.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#include "gdb_wait.h"
#include <signal.h>
#include <ctype.h>
#include "gdb_bfd.h"
#include "inflow.h"
#include "auxv.h"
#include "procfs.h"
#include "observer.h"
/* This module provides the interface between GDB and the
/proc file system, which is used on many versions of Unix
as a means for debuggers to control other processes.
Examples of the systems that use this interface are:
Irix
Solaris
OSF
AIX5
/proc works by imitating a file system: you open a simulated file
that represents the process you wish to interact with, and perform
operations on that "file" in order to examine or change the state
of the other process.
The most important thing to know about /proc and this module is
that there are two very different interfaces to /proc:
One that uses the ioctl system call, and another that uses read
and write system calls.
This module has to support both /proc interfaces. This means that
there are two different ways of doing every basic operation.
In order to keep most of the code simple and clean, I have defined
an interface "layer" which hides all these system calls. An ifdef
(NEW_PROC_API) determines which interface we are using, and most or
all occurrances of this ifdef should be confined to this interface
layer. */
/* Determine which /proc API we are using: The ioctl API defines
PIOCSTATUS, while the read/write (multiple fd) API never does. */
#ifdef NEW_PROC_API
#include <sys/types.h>
#include <dirent.h> /* opendir/readdir, for listing the LWP's */
#endif
#include <fcntl.h> /* for O_RDONLY */
#include <unistd.h> /* for "X_OK" */
#include <sys/stat.h> /* for struct stat */
/* Note: procfs-utils.h must be included after the above system header
files, because it redefines various system calls using macros.
This may be incompatible with the prototype declarations. */
#include "proc-utils.h"
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* =================== TARGET_OPS "MODULE" =================== */
/* This module defines the GDB target vector and its methods. */
static void procfs_attach (struct target_ops *, const char *, int);
static void procfs_detach (struct target_ops *, const char *, int);
static void procfs_resume (struct target_ops *,
ptid_t, int, enum gdb_signal);
static void procfs_interrupt (struct target_ops *self, ptid_t);
static void procfs_files_info (struct target_ops *);
static void procfs_fetch_registers (struct target_ops *,
struct regcache *, int);
static void procfs_store_registers (struct target_ops *,
struct regcache *, int);
static void procfs_pass_signals (struct target_ops *self,
int, unsigned char *);
static void procfs_kill_inferior (struct target_ops *ops);
static void procfs_mourn_inferior (struct target_ops *ops);
static void procfs_create_inferior (struct target_ops *, char *,
char *, char **, int);
static ptid_t procfs_wait (struct target_ops *,
ptid_t, struct target_waitstatus *, int);
static enum target_xfer_status procfs_xfer_memory (gdb_byte *,
const gdb_byte *,
ULONGEST, ULONGEST,
ULONGEST *);
static target_xfer_partial_ftype procfs_xfer_partial;
static int procfs_thread_alive (struct target_ops *ops, ptid_t);
static void procfs_update_thread_list (struct target_ops *ops);
static char *procfs_pid_to_str (struct target_ops *, ptid_t);
static int proc_find_memory_regions (struct target_ops *self,
find_memory_region_ftype, void *);
static char * procfs_make_note_section (struct target_ops *self,
bfd *, int *);
static int procfs_can_use_hw_breakpoint (struct target_ops *self,
enum bptype, int, int);
static void procfs_info_proc (struct target_ops *, const char *,
enum info_proc_what);
#if defined (PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)
/* When GDB is built as 64-bit application on Solaris, the auxv data
is presented in 64-bit format. We need to provide a custom parser
to handle that. */
static int
procfs_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
{
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
gdb_byte *ptr = *readptr;
if (endptr == ptr)
return 0;
if (endptr - ptr < 8 * 2)
return -1;
*typep = extract_unsigned_integer (ptr, 4, byte_order);
ptr += 8;
/* The size of data is always 64-bit. If the application is 32-bit,
it will be zero extended, as expected. */
*valp = extract_unsigned_integer (ptr, 8, byte_order);
ptr += 8;
*readptr = ptr;
return 1;
}
#endif
struct target_ops *
procfs_target (void)
{
struct target_ops *t = inf_child_target ();
t->to_create_inferior = procfs_create_inferior;
t->to_kill = procfs_kill_inferior;
t->to_mourn_inferior = procfs_mourn_inferior;
t->to_attach = procfs_attach;
t->to_detach = procfs_detach;
t->to_wait = procfs_wait;
t->to_resume = procfs_resume;
t->to_fetch_registers = procfs_fetch_registers;
t->to_store_registers = procfs_store_registers;
t->to_xfer_partial = procfs_xfer_partial;
t->to_pass_signals = procfs_pass_signals;
t->to_files_info = procfs_files_info;
t->to_interrupt = procfs_interrupt;
t->to_update_thread_list = procfs_update_thread_list;
t->to_thread_alive = procfs_thread_alive;
t->to_pid_to_str = procfs_pid_to_str;
t->to_has_thread_control = tc_schedlock;
t->to_find_memory_regions = proc_find_memory_regions;
t->to_make_corefile_notes = procfs_make_note_section;
t->to_info_proc = procfs_info_proc;
#if defined(PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)
t->to_auxv_parse = procfs_auxv_parse;
#endif
t->to_magic = OPS_MAGIC;
return t;
}
/* =================== END, TARGET_OPS "MODULE" =================== */
/* World Unification:
Put any typedefs, defines etc. here that are required for the
unification of code that handles different versions of /proc. */
#ifdef NEW_PROC_API /* Solaris 7 && 8 method for watchpoints */
#ifdef WA_READ
enum { READ_WATCHFLAG = WA_READ,
WRITE_WATCHFLAG = WA_WRITE,
EXEC_WATCHFLAG = WA_EXEC,
AFTER_WATCHFLAG = WA_TRAPAFTER
};
#endif
#else /* Irix method for watchpoints */
enum { READ_WATCHFLAG = MA_READ,
WRITE_WATCHFLAG = MA_WRITE,
EXEC_WATCHFLAG = MA_EXEC,
AFTER_WATCHFLAG = 0 /* trapafter not implemented */
};
#endif
/* gdb_sigset_t */
#ifdef HAVE_PR_SIGSET_T
typedef pr_sigset_t gdb_sigset_t;
#else
typedef sigset_t gdb_sigset_t;
#endif
/* sigaction */
#ifdef HAVE_PR_SIGACTION64_T
typedef pr_sigaction64_t gdb_sigaction_t;
#else
typedef struct sigaction gdb_sigaction_t;
#endif
/* siginfo */
#ifdef HAVE_PR_SIGINFO64_T
typedef pr_siginfo64_t gdb_siginfo_t;
#else
typedef siginfo_t gdb_siginfo_t;
#endif
/* On mips-irix, praddset and prdelset are defined in such a way that
they return a value, which causes GCC to emit a -Wunused error
because the returned value is not used. Prevent this warning
by casting the return value to void. On sparc-solaris, this issue
does not exist because the definition of these macros already include
that cast to void. */
#define gdb_praddset(sp, flag) ((void) praddset (sp, flag))
#define gdb_prdelset(sp, flag) ((void) prdelset (sp, flag))
/* gdb_premptysysset */
#ifdef premptysysset
#define gdb_premptysysset premptysysset
#else
#define gdb_premptysysset premptyset
#endif
/* praddsysset */
#ifdef praddsysset
#define gdb_praddsysset praddsysset
#else
#define gdb_praddsysset gdb_praddset
#endif
/* prdelsysset */
#ifdef prdelsysset
#define gdb_prdelsysset prdelsysset
#else
#define gdb_prdelsysset gdb_prdelset
#endif
/* prissyssetmember */
#ifdef prissyssetmember
#define gdb_pr_issyssetmember prissyssetmember
#else
#define gdb_pr_issyssetmember prismember
#endif
/* As a feature test, saying ``#if HAVE_PRSYSENT_T'' everywhere isn't
as intuitively descriptive as it could be, so we'll define
DYNAMIC_SYSCALLS to mean the same thing. Anyway, at the time of
this writing, this feature is only found on AIX5 systems and
basically means that the set of syscalls is not fixed. I.e,
there's no nice table that one can #include to get all of the
syscall numbers. Instead, they're stored in /proc/PID/sysent
for each process. We are at least guaranteed that they won't
change over the lifetime of the process. But each process could
(in theory) have different syscall numbers. */
#ifdef HAVE_PRSYSENT_T
#define DYNAMIC_SYSCALLS
#endif
/* =================== STRUCT PROCINFO "MODULE" =================== */
/* FIXME: this comment will soon be out of date W.R.T. threads. */
/* The procinfo struct is a wrapper to hold all the state information
concerning a /proc process. There should be exactly one procinfo
for each process, and since GDB currently can debug only one
process at a time, that means there should be only one procinfo.
All of the LWP's of a process can be accessed indirectly thru the
single process procinfo.
However, against the day when GDB may debug more than one process,
this data structure is kept in a list (which for now will hold no
more than one member), and many functions will have a pointer to a
procinfo as an argument.
There will be a separate procinfo structure for use by the (not yet
implemented) "info proc" command, so that we can print useful
information about any random process without interfering with the
inferior's procinfo information. */
#ifdef NEW_PROC_API
/* format strings for /proc paths */
# ifndef CTL_PROC_NAME_FMT
# define MAIN_PROC_NAME_FMT "/proc/%d"
# define CTL_PROC_NAME_FMT "/proc/%d/ctl"
# define AS_PROC_NAME_FMT "/proc/%d/as"
# define MAP_PROC_NAME_FMT "/proc/%d/map"
# define STATUS_PROC_NAME_FMT "/proc/%d/status"
# define MAX_PROC_NAME_SIZE sizeof("/proc/99999/lwp/8096/lstatus")
# endif
/* the name of the proc status struct depends on the implementation */
typedef pstatus_t gdb_prstatus_t;
typedef lwpstatus_t gdb_lwpstatus_t;
#else /* ! NEW_PROC_API */
/* format strings for /proc paths */
# ifndef CTL_PROC_NAME_FMT
# define MAIN_PROC_NAME_FMT "/proc/%05d"
# define CTL_PROC_NAME_FMT "/proc/%05d"
# define AS_PROC_NAME_FMT "/proc/%05d"
# define MAP_PROC_NAME_FMT "/proc/%05d"
# define STATUS_PROC_NAME_FMT "/proc/%05d"
# define MAX_PROC_NAME_SIZE sizeof("/proc/ttttppppp")
# endif
/* The name of the proc status struct depends on the implementation. */
typedef prstatus_t gdb_prstatus_t;
typedef prstatus_t gdb_lwpstatus_t;
#endif /* NEW_PROC_API */
typedef struct procinfo {
struct procinfo *next;
int pid; /* Process ID */
int tid; /* Thread/LWP id */
/* process state */
int was_stopped;
int ignore_next_sigstop;
/* The following four fd fields may be identical, or may contain
several different fd's, depending on the version of /proc
(old ioctl or new read/write). */
int ctl_fd; /* File descriptor for /proc control file */
/* The next three file descriptors are actually only needed in the
read/write, multiple-file-descriptor implemenation
(NEW_PROC_API). However, to avoid a bunch of #ifdefs in the
code, we will use them uniformly by (in the case of the ioctl
single-file-descriptor implementation) filling them with copies
of the control fd. */
int status_fd; /* File descriptor for /proc status file */
int as_fd; /* File descriptor for /proc as file */
char pathname[MAX_PROC_NAME_SIZE]; /* Pathname to /proc entry */
fltset_t saved_fltset; /* Saved traced hardware fault set */
gdb_sigset_t saved_sigset; /* Saved traced signal set */
gdb_sigset_t saved_sighold; /* Saved held signal set */
sysset_t *saved_exitset; /* Saved traced system call exit set */
sysset_t *saved_entryset; /* Saved traced system call entry set */
gdb_prstatus_t prstatus; /* Current process status info */
#ifndef NEW_PROC_API
gdb_fpregset_t fpregset; /* Current floating point registers */
#endif
#ifdef DYNAMIC_SYSCALLS
int num_syscalls; /* Total number of syscalls */
char **syscall_names; /* Syscall number to name map */
#endif
struct procinfo *thread_list;
int status_valid : 1;
int gregs_valid : 1;
int fpregs_valid : 1;
int threads_valid: 1;
} procinfo;
static char errmsg[128]; /* shared error msg buffer */
/* Function prototypes for procinfo module: */
static procinfo *find_procinfo_or_die (int pid, int tid);
static procinfo *find_procinfo (int pid, int tid);
static procinfo *create_procinfo (int pid, int tid);
static void destroy_procinfo (procinfo * p);
static void do_destroy_procinfo_cleanup (void *);
static void dead_procinfo (procinfo * p, char *msg, int killp);
static int open_procinfo_files (procinfo * p, int which);
static void close_procinfo_files (procinfo * p);
static int sysset_t_size (procinfo *p);
static sysset_t *sysset_t_alloc (procinfo * pi);
#ifdef DYNAMIC_SYSCALLS
static void load_syscalls (procinfo *pi);
static void free_syscalls (procinfo *pi);
static int find_syscall (procinfo *pi, char *name);
#endif /* DYNAMIC_SYSCALLS */
static int iterate_over_mappings
(procinfo *pi, find_memory_region_ftype child_func, void *data,
int (*func) (struct prmap *map, find_memory_region_ftype child_func,
void *data));
/* The head of the procinfo list: */
static procinfo * procinfo_list;
/* Search the procinfo list. Return a pointer to procinfo, or NULL if
not found. */
static procinfo *
find_procinfo (int pid, int tid)
{
procinfo *pi;
for (pi = procinfo_list; pi; pi = pi->next)
if (pi->pid == pid)
break;
if (pi)
if (tid)
{
/* Don't check threads_valid. If we're updating the
thread_list, we want to find whatever threads are already
here. This means that in general it is the caller's
responsibility to check threads_valid and update before
calling find_procinfo, if the caller wants to find a new
thread. */
for (pi = pi->thread_list; pi; pi = pi->next)
if (pi->tid == tid)
break;
}
return pi;
}
/* Calls find_procinfo, but errors on failure. */
static procinfo *
find_procinfo_or_die (int pid, int tid)
{
procinfo *pi = find_procinfo (pid, tid);
if (pi == NULL)
{
if (tid)
error (_("procfs: couldn't find pid %d "
"(kernel thread %d) in procinfo list."),
pid, tid);
else
error (_("procfs: couldn't find pid %d in procinfo list."), pid);
}
return pi;
}
/* Wrapper for `open'. The appropriate open call is attempted; if
unsuccessful, it will be retried as many times as needed for the
EAGAIN and EINTR conditions.
For other conditions, retry the open a limited number of times. In
addition, a short sleep is imposed prior to retrying the open. The
reason for this sleep is to give the kernel a chance to catch up
and create the file in question in the event that GDB "wins" the
race to open a file before the kernel has created it. */
static int
open_with_retry (const char *pathname, int flags)
{
int retries_remaining, status;
retries_remaining = 2;
while (1)
{
status = open (pathname, flags);
if (status >= 0 || retries_remaining == 0)
break;
else if (errno != EINTR && errno != EAGAIN)
{
retries_remaining--;
sleep (1);
}
}
return status;
}
/* Open the file descriptor for the process or LWP. If NEW_PROC_API
is defined, we only open the control file descriptor; the others
are opened lazily as needed. Otherwise (if not NEW_PROC_API),
there is only one real file descriptor, but we keep multiple copies
of it so that the code that uses them does not have to be #ifdef'd.
Returns the file descriptor, or zero for failure. */
enum { FD_CTL, FD_STATUS, FD_AS };
static int
open_procinfo_files (procinfo *pi, int which)
{
#ifdef NEW_PROC_API
char tmp[MAX_PROC_NAME_SIZE];
#endif
int fd;
/* This function is getting ALMOST long enough to break up into
several. Here is some rationale:
NEW_PROC_API (Solaris 2.6, Solaris 2.7):
There are several file descriptors that may need to be open
for any given process or LWP. The ones we're intereted in are:
- control (ctl) write-only change the state
- status (status) read-only query the state
- address space (as) read/write access memory
- map (map) read-only virtual addr map
Most of these are opened lazily as they are needed.
The pathnames for the 'files' for an LWP look slightly
different from those of a first-class process:
Pathnames for a process (<proc-id>):
/proc/<proc-id>/ctl
/proc/<proc-id>/status
/proc/<proc-id>/as
/proc/<proc-id>/map
Pathnames for an LWP (lwp-id):
/proc/<proc-id>/lwp/<lwp-id>/lwpctl
/proc/<proc-id>/lwp/<lwp-id>/lwpstatus
An LWP has no map or address space file descriptor, since
the memory map and address space are shared by all LWPs.
Everyone else (Solaris 2.5, Irix, OSF)
There is only one file descriptor for each process or LWP.
For convenience, we copy the same file descriptor into all
three fields of the procinfo struct (ctl_fd, status_fd, and
as_fd, see NEW_PROC_API above) so that code that uses them
doesn't need any #ifdef's.
Pathname for all:
/proc/<proc-id>
Solaris 2.5 LWP's:
Each LWP has an independent file descriptor, but these
are not obtained via the 'open' system call like the rest:
instead, they're obtained thru an ioctl call (PIOCOPENLWP)
to the file descriptor of the parent process.
OSF threads:
These do not even have their own independent file descriptor.
All operations are carried out on the file descriptor of the
parent process. Therefore we just call open again for each
thread, getting a new handle for the same 'file'. */
#ifdef NEW_PROC_API
/* In this case, there are several different file descriptors that
we might be asked to open. The control file descriptor will be
opened early, but the others will be opened lazily as they are
needed. */
strcpy (tmp, pi->pathname);
switch (which) { /* Which file descriptor to open? */
case FD_CTL:
if (pi->tid)
strcat (tmp, "/lwpctl");
else
strcat (tmp, "/ctl");
fd = open_with_retry (tmp, O_WRONLY);
if (fd < 0)
return 0; /* fail */
pi->ctl_fd = fd;
break;
case FD_AS:
if (pi->tid)
return 0; /* There is no 'as' file descriptor for an lwp. */
strcat (tmp, "/as");
fd = open_with_retry (tmp, O_RDWR);
if (fd < 0)
return 0; /* fail */
pi->as_fd = fd;
break;
case FD_STATUS:
if (pi->tid)
strcat (tmp, "/lwpstatus");
else
strcat (tmp, "/status");
fd = open_with_retry (tmp, O_RDONLY);
if (fd < 0)
return 0; /* fail */
pi->status_fd = fd;
break;
default:
return 0; /* unknown file descriptor */
}
#else /* not NEW_PROC_API */
/* In this case, there is only one file descriptor for each procinfo
(ie. each process or LWP). In fact, only the file descriptor for
the process can actually be opened by an 'open' system call. The
ones for the LWPs have to be obtained thru an IOCTL call on the
process's file descriptor.
For convenience, we copy each procinfo's single file descriptor
into all of the fields occupied by the several file descriptors
of the NEW_PROC_API implementation. That way, the code that uses
them can be written without ifdefs. */
#ifdef PIOCTSTATUS /* OSF */
/* Only one FD; just open it. */
if ((fd = open_with_retry (pi->pathname, O_RDWR)) < 0)
return 0;
#else /* Sol 2.5, Irix, other? */
if (pi->tid == 0) /* Master procinfo for the process */
{
fd = open_with_retry (pi->pathname, O_RDWR);
if (fd < 0)
return 0; /* fail */
}
else /* LWP thread procinfo */
{
#ifdef PIOCOPENLWP /* Sol 2.5, thread/LWP */
procinfo *process;
int lwpid = pi->tid;
/* Find the procinfo for the entire process. */
if ((process = find_procinfo (pi->pid, 0)) == NULL)
return 0; /* fail */
/* Now obtain the file descriptor for the LWP. */
if ((fd = ioctl (process->ctl_fd, PIOCOPENLWP, &lwpid)) < 0)
return 0; /* fail */
#else /* Irix, other? */
return 0; /* Don't know how to open threads. */
#endif /* Sol 2.5 PIOCOPENLWP */
}
#endif /* OSF PIOCTSTATUS */
pi->ctl_fd = pi->as_fd = pi->status_fd = fd;
#endif /* NEW_PROC_API */
return 1; /* success */
}
/* Allocate a data structure and link it into the procinfo list.
First tries to find a pre-existing one (FIXME: why?). Returns the
pointer to new procinfo struct. */
static procinfo *
create_procinfo (int pid, int tid)
{
procinfo *pi, *parent = NULL;
if ((pi = find_procinfo (pid, tid)))
return pi; /* Already exists, nothing to do. */
/* Find parent before doing malloc, to save having to cleanup. */
if (tid != 0)
parent = find_procinfo_or_die (pid, 0); /* FIXME: should I
create it if it
doesn't exist yet? */
pi = XNEW (procinfo);
memset (pi, 0, sizeof (procinfo));
pi->pid = pid;
pi->tid = tid;
#ifdef DYNAMIC_SYSCALLS
load_syscalls (pi);
#endif
pi->saved_entryset = sysset_t_alloc (pi);
pi->saved_exitset = sysset_t_alloc (pi);
/* Chain into list. */
if (tid == 0)
{
sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);
pi->next = procinfo_list;
procinfo_list = pi;
}
else
{
#ifdef NEW_PROC_API
sprintf (pi->pathname, "/proc/%05d/lwp/%d", pid, tid);
#else
sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);
#endif
pi->next = parent->thread_list;
parent->thread_list = pi;
}
return pi;
}
/* Close all file descriptors associated with the procinfo. */
static void
close_procinfo_files (procinfo *pi)
{
if (pi->ctl_fd > 0)
close (pi->ctl_fd);
#ifdef NEW_PROC_API
if (pi->as_fd > 0)
close (pi->as_fd);
if (pi->status_fd > 0)
close (pi->status_fd);
#endif
pi->ctl_fd = pi->as_fd = pi->status_fd = 0;
}
/* Destructor function. Close, unlink and deallocate the object. */
static void
destroy_one_procinfo (procinfo **list, procinfo *pi)
{
procinfo *ptr;
/* Step one: unlink the procinfo from its list. */
if (pi == *list)
*list = pi->next;
else
for (ptr = *list; ptr; ptr = ptr->next)
if (ptr->next == pi)
{
ptr->next = pi->next;
break;
}
/* Step two: close any open file descriptors. */
close_procinfo_files (pi);
/* Step three: free the memory. */
#ifdef DYNAMIC_SYSCALLS
free_syscalls (pi);
#endif
xfree (pi->saved_entryset);
xfree (pi->saved_exitset);
xfree (pi);
}
static void
destroy_procinfo (procinfo *pi)
{
procinfo *tmp;
if (pi->tid != 0) /* Destroy a thread procinfo. */
{
tmp = find_procinfo (pi->pid, 0); /* Find the parent process. */
destroy_one_procinfo (&tmp->thread_list, pi);
}
else /* Destroy a process procinfo and all its threads. */
{
/* First destroy the children, if any; */
while (pi->thread_list != NULL)
destroy_one_procinfo (&pi->thread_list, pi->thread_list);
/* Then destroy the parent. Genocide!!! */
destroy_one_procinfo (&procinfo_list, pi);
}
}
static void
do_destroy_procinfo_cleanup (void *pi)
{
destroy_procinfo (pi);
}
enum { NOKILL, KILL };
/* To be called on a non_recoverable error for a procinfo. Prints
error messages, optionally sends a SIGKILL to the process, then
destroys the data structure. */
static void
dead_procinfo (procinfo *pi, char *msg, int kill_p)
{
char procfile[80];
if (pi->pathname)
{
print_sys_errmsg (pi->pathname, errno);
}
else
{
sprintf (procfile, "process %d", pi->pid);
print_sys_errmsg (procfile, errno);
}
if (kill_p == KILL)
kill (pi->pid, SIGKILL);
destroy_procinfo (pi);
error ("%s", msg);
}
/* Returns the (complete) size of a sysset_t struct. Normally, this
is just sizeof (sysset_t), but in the case of Monterey/64, the
actual size of sysset_t isn't known until runtime. */
static int
sysset_t_size (procinfo * pi)
{
#ifndef DYNAMIC_SYSCALLS
return sizeof (sysset_t);
#else
return sizeof (sysset_t) - sizeof (uint64_t)
+ sizeof (uint64_t) * ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))
/ (8 * sizeof (uint64_t)));
#endif
}
/* Allocate and (partially) initialize a sysset_t struct. */
static sysset_t *
sysset_t_alloc (procinfo * pi)
{
sysset_t *ret;
int size = sysset_t_size (pi);
ret = xmalloc (size);
#ifdef DYNAMIC_SYSCALLS
ret->pr_size = ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))
/ (8 * sizeof (uint64_t)));
#endif
return ret;
}
#ifdef DYNAMIC_SYSCALLS
/* Extract syscall numbers and names from /proc/<pid>/sysent. Initialize
pi->num_syscalls with the number of syscalls and pi->syscall_names
with the names. (Certain numbers may be skipped in which case the
names for these numbers will be left as NULL.) */
#define MAX_SYSCALL_NAME_LENGTH 256
#define MAX_SYSCALLS 65536
static void
load_syscalls (procinfo *pi)
{
char pathname[MAX_PROC_NAME_SIZE];
int sysent_fd;
prsysent_t header;
prsyscall_t *syscalls;
int i, size, maxcall;
struct cleanup *cleanups;
pi->num_syscalls = 0;
pi->syscall_names = 0;
/* Open the file descriptor for the sysent file. */
sprintf (pathname, "/proc/%d/sysent", pi->pid);
sysent_fd = open_with_retry (pathname, O_RDONLY);
if (sysent_fd < 0)
{
error (_("load_syscalls: Can't open /proc/%d/sysent"), pi->pid);
}
cleanups = make_cleanup_close (sysent_fd);
size = sizeof header - sizeof (prsyscall_t);
if (read (sysent_fd, &header, size) != size)
{
error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);
}
if (header.pr_nsyscalls == 0)
{
error (_("load_syscalls: /proc/%d/sysent contains no syscalls!"),
pi->pid);
}
size = header.pr_nsyscalls * sizeof (prsyscall_t);
syscalls = xmalloc (size);
make_cleanup (free_current_contents, &syscalls);
if (read (sysent_fd, syscalls, size) != size)
error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);
/* Find maximum syscall number. This may not be the same as
pr_nsyscalls since that value refers to the number of entries
in the table. (Also, the docs indicate that some system
call numbers may be skipped.) */
maxcall = syscalls[0].pr_number;
for (i = 1; i < header.pr_nsyscalls; i++)
if (syscalls[i].pr_number > maxcall
&& syscalls[i].pr_nameoff > 0
&& syscalls[i].pr_number < MAX_SYSCALLS)
maxcall = syscalls[i].pr_number;
pi->num_syscalls = maxcall+1;
pi->syscall_names = XNEWVEC (char *, pi->num_syscalls);
for (i = 0; i < pi->num_syscalls; i++)
pi->syscall_names[i] = NULL;
/* Read the syscall names in. */
for (i = 0; i < header.pr_nsyscalls; i++)
{
char namebuf[MAX_SYSCALL_NAME_LENGTH];
int nread;
int callnum;
if (syscalls[i].pr_number >= MAX_SYSCALLS
|| syscalls[i].pr_number < 0
|| syscalls[i].pr_nameoff <= 0
|| (lseek (sysent_fd, (off_t) syscalls[i].pr_nameoff, SEEK_SET)
!= (off_t) syscalls[i].pr_nameoff))
continue;
nread = read (sysent_fd, namebuf, sizeof namebuf);
if (nread <= 0)
continue;
callnum = syscalls[i].pr_number;
if (pi->syscall_names[callnum] != NULL)
{
/* FIXME: Generate warning. */
continue;
}
namebuf[nread-1] = '\0';
size = strlen (namebuf) + 1;
pi->syscall_names[callnum] = xmalloc (size);
strncpy (pi->syscall_names[callnum], namebuf, size-1);
pi->syscall_names[callnum][size-1] = '\0';
}
do_cleanups (cleanups);
}
/* Free the space allocated for the syscall names from the procinfo
structure. */
static void
free_syscalls (procinfo *pi)
{
if (pi->syscall_names)
{
int i;
for (i = 0; i < pi->num_syscalls; i++)
if (pi->syscall_names[i] != NULL)
xfree (pi->syscall_names[i]);
xfree (pi->syscall_names);
pi->syscall_names = 0;
}
}
/* Given a name, look up (and return) the corresponding syscall number.
If no match is found, return -1. */
static int
find_syscall (procinfo *pi, char *name)
{
int i;
for (i = 0; i < pi->num_syscalls; i++)
{
if (pi->syscall_names[i] && strcmp (name, pi->syscall_names[i]) == 0)
return i;
}
return -1;
}
#endif
/* =================== END, STRUCT PROCINFO "MODULE" =================== */
/* =================== /proc "MODULE" =================== */
/* This "module" is the interface layer between the /proc system API
and the gdb target vector functions. This layer consists of access
functions that encapsulate each of the basic operations that we
need to use from the /proc API.
The main motivation for this layer is to hide the fact that there
are two very different implementations of the /proc API. Rather
than have a bunch of #ifdefs all thru the gdb target vector
functions, we do our best to hide them all in here. */
static long proc_flags (procinfo * pi);
static int proc_why (procinfo * pi);
static int proc_what (procinfo * pi);
static int proc_set_current_signal (procinfo * pi, int signo);
static int proc_get_current_thread (procinfo * pi);
static int proc_iterate_over_threads
(procinfo * pi,
int (*func) (procinfo *, procinfo *, void *),
void *ptr);
static void
proc_warn (procinfo *pi, char *func, int line)
{
sprintf (errmsg, "procfs: %s line %d, %s", func, line, pi->pathname);
print_sys_errmsg (errmsg, errno);
}
static void
proc_error (procinfo *pi, char *func, int line)
{
sprintf (errmsg, "procfs: %s line %d, %s", func, line, pi->pathname);
perror_with_name (errmsg);
}
/* Updates the status struct in the procinfo. There is a 'valid'
flag, to let other functions know when this function needs to be
called (so the status is only read when it is needed). The status
file descriptor is also only opened when it is needed. Returns
non-zero for success, zero for failure. */
static int
proc_get_status (procinfo *pi)
{
/* Status file descriptor is opened "lazily". */
if (pi->status_fd == 0 &&
open_procinfo_files (pi, FD_STATUS) == 0)
{
pi->status_valid = 0;
return 0;
}
#ifdef NEW_PROC_API
if (lseek (pi->status_fd, 0, SEEK_SET) < 0)
pi->status_valid = 0; /* fail */
else
{
/* Sigh... I have to read a different data structure,
depending on whether this is a main process or an LWP. */
if (pi->tid)
pi->status_valid = (read (pi->status_fd,
(char *) &pi->prstatus.pr_lwp,
sizeof (lwpstatus_t))
== sizeof (lwpstatus_t));
else
{
pi->status_valid = (read (pi->status_fd,
(char *) &pi->prstatus,
sizeof (gdb_prstatus_t))
== sizeof (gdb_prstatus_t));
}
}
#else /* ioctl method */
#ifdef PIOCTSTATUS /* osf */
if (pi->tid == 0) /* main process */
{
/* Just read the danged status. Now isn't that simple? */
pi->status_valid =
(ioctl (pi->status_fd, PIOCSTATUS, &pi->prstatus) >= 0);
}
else
{
int win;
struct {
long pr_count;
tid_t pr_error_thread;
struct prstatus status;
} thread_status;
thread_status.pr_count = 1;
thread_status.status.pr_tid = pi->tid;
win = (ioctl (pi->status_fd, PIOCTSTATUS, &thread_status) >= 0);
if (win)
{
memcpy (&pi->prstatus, &thread_status.status,
sizeof (pi->prstatus));
pi->status_valid = 1;
}
}
#else
/* Just read the danged status. Now isn't that simple? */
pi->status_valid = (ioctl (pi->status_fd, PIOCSTATUS, &pi->prstatus) >= 0);
#endif
#endif
if (pi->status_valid)
{
PROC_PRETTYFPRINT_STATUS (proc_flags (pi),
proc_why (pi),
proc_what (pi),
proc_get_current_thread (pi));
}
/* The status struct includes general regs, so mark them valid too. */
pi->gregs_valid = pi->status_valid;
#ifdef NEW_PROC_API
/* In the read/write multiple-fd model, the status struct includes
the fp regs too, so mark them valid too. */
pi->fpregs_valid = pi->status_valid;
#endif
return pi->status_valid; /* True if success, false if failure. */
}
/* Returns the process flags (pr_flags field). */
static long
proc_flags (procinfo *pi)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0; /* FIXME: not a good failure value (but what is?) */
#ifdef NEW_PROC_API
return pi->prstatus.pr_lwp.pr_flags;
#else
return pi->prstatus.pr_flags;
#endif
}
/* Returns the pr_why field (why the process stopped). */
static int
proc_why (procinfo *pi)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0; /* FIXME: not a good failure value (but what is?) */
#ifdef NEW_PROC_API
return pi->prstatus.pr_lwp.pr_why;
#else
return pi->prstatus.pr_why;
#endif
}
/* Returns the pr_what field (details of why the process stopped). */
static int
proc_what (procinfo *pi)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0; /* FIXME: not a good failure value (but what is?) */
#ifdef NEW_PROC_API
return pi->prstatus.pr_lwp.pr_what;
#else
return pi->prstatus.pr_what;
#endif
}
/* This function is only called when PI is stopped by a watchpoint.
Assuming the OS supports it, write to *ADDR the data address which
triggered it and return 1. Return 0 if it is not possible to know
the address. */
static int
proc_watchpoint_address (procinfo *pi, CORE_ADDR *addr)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0;
#ifdef NEW_PROC_API
*addr = (CORE_ADDR) gdbarch_pointer_to_address (target_gdbarch (),
builtin_type (target_gdbarch ())->builtin_data_ptr,
(gdb_byte *) &pi->prstatus.pr_lwp.pr_info.si_addr);
#else
*addr = (CORE_ADDR) gdbarch_pointer_to_address (target_gdbarch (),
builtin_type (target_gdbarch ())->builtin_data_ptr,
(gdb_byte *) &pi->prstatus.pr_info.si_addr);
#endif
return 1;
}
#ifndef PIOCSSPCACT /* The following is not supported on OSF. */
/* Returns the pr_nsysarg field (number of args to the current
syscall). */
static int
proc_nsysarg (procinfo *pi)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0;
#ifdef NEW_PROC_API
return pi->prstatus.pr_lwp.pr_nsysarg;
#else
return pi->prstatus.pr_nsysarg;
#endif
}
/* Returns the pr_sysarg field (pointer to the arguments of current
syscall). */
static long *
proc_sysargs (procinfo *pi)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return NULL;
#ifdef NEW_PROC_API
return (long *) &pi->prstatus.pr_lwp.pr_sysarg;
#else
return (long *) &pi->prstatus.pr_sysarg;
#endif
}
#endif /* PIOCSSPCACT */
#ifdef PROCFS_DONT_PIOCSSIG_CURSIG
/* Returns the pr_cursig field (current signal). */
static long
proc_cursig (struct procinfo *pi)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0; /* FIXME: not a good failure value (but what is?) */
#ifdef NEW_PROC_API
return pi->prstatus.pr_lwp.pr_cursig;
#else
return pi->prstatus.pr_cursig;
#endif
}
#endif /* PROCFS_DONT_PIOCSSIG_CURSIG */
/* === I appologize for the messiness of this function.
=== This is an area where the different versions of
=== /proc are more inconsistent than usual.
Set or reset any of the following process flags:
PR_FORK -- forked child will inherit trace flags
PR_RLC -- traced process runs when last /proc file closed.
PR_KLC -- traced process is killed when last /proc file closed.
PR_ASYNC -- LWP's get to run/stop independently.
There are three methods for doing this function:
1) Newest: read/write [PCSET/PCRESET/PCUNSET]
[Sol6, Sol7, UW]
2) Middle: PIOCSET/PIOCRESET
[Irix, Sol5]
3) Oldest: PIOCSFORK/PIOCRFORK/PIOCSRLC/PIOCRRLC
[OSF, Sol5]
Note: Irix does not define PR_ASYNC.
Note: OSF does not define PR_KLC.
Note: OSF is the only one that can ONLY use the oldest method.
Arguments:
pi -- the procinfo
flag -- one of PR_FORK, PR_RLC, or PR_ASYNC
mode -- 1 for set, 0 for reset.
Returns non-zero for success, zero for failure. */
enum { FLAG_RESET, FLAG_SET };
static int
proc_modify_flag (procinfo *pi, long flag, long mode)
{
long win = 0; /* default to fail */
/* These operations affect the process as a whole, and applying them
to an individual LWP has the same meaning as applying them to the
main process. Therefore, if we're ever called with a pointer to
an LWP's procinfo, let's substitute the process's procinfo and
avoid opening the LWP's file descriptor unnecessarily. */
if (pi->pid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API /* Newest method: Newer Solarii. */
/* First normalize the PCUNSET/PCRESET command opcode
(which for no obvious reason has a different definition
from one operating system to the next...) */
#ifdef PCUNSET
#define GDBRESET PCUNSET
#else
#ifdef PCRESET
#define GDBRESET PCRESET
#endif
#endif
{
procfs_ctl_t arg[2];
if (mode == FLAG_SET) /* Set the flag (RLC, FORK, or ASYNC). */
arg[0] = PCSET;
else /* Reset the flag. */
arg[0] = GDBRESET;
arg[1] = flag;
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
}
#else
#ifdef PIOCSET /* Irix/Sol5 method */
if (mode == FLAG_SET) /* Set the flag (hopefully RLC, FORK, or ASYNC). */
{
win = (ioctl (pi->ctl_fd, PIOCSET, &flag) >= 0);
}
else /* Reset the flag. */
{
win = (ioctl (pi->ctl_fd, PIOCRESET, &flag) >= 0);
}
#else
#ifdef PIOCSRLC /* Oldest method: OSF */
switch (flag) {
case PR_RLC:
if (mode == FLAG_SET) /* Set run-on-last-close */
{
win = (ioctl (pi->ctl_fd, PIOCSRLC, NULL) >= 0);
}
else /* Clear run-on-last-close */
{
win = (ioctl (pi->ctl_fd, PIOCRRLC, NULL) >= 0);
}
break;
case PR_FORK:
if (mode == FLAG_SET) /* Set inherit-on-fork */
{
win = (ioctl (pi->ctl_fd, PIOCSFORK, NULL) >= 0);
}
else /* Clear inherit-on-fork */
{
win = (ioctl (pi->ctl_fd, PIOCRFORK, NULL) >= 0);
}
break;
default:
win = 0; /* Fail -- unknown flag (can't do PR_ASYNC). */
break;
}
#endif
#endif
#endif
#undef GDBRESET
/* The above operation renders the procinfo's cached pstatus
obsolete. */
pi->status_valid = 0;
if (!win)
warning (_("procfs: modify_flag failed to turn %s %s"),
flag == PR_FORK ? "PR_FORK" :
flag == PR_RLC ? "PR_RLC" :
#ifdef PR_ASYNC
flag == PR_ASYNC ? "PR_ASYNC" :
#endif
#ifdef PR_KLC
flag == PR_KLC ? "PR_KLC" :
#endif
"<unknown flag>",
mode == FLAG_RESET ? "off" : "on");
return win;
}
/* Set the run_on_last_close flag. Process with all threads will
become runnable when debugger closes all /proc fds. Returns
non-zero for success, zero for failure. */
static int
proc_set_run_on_last_close (procinfo *pi)
{
return proc_modify_flag (pi, PR_RLC, FLAG_SET);
}
/* Reset the run_on_last_close flag. The process will NOT become
runnable when debugger closes its file handles. Returns non-zero
for success, zero for failure. */
static int
proc_unset_run_on_last_close (procinfo *pi)
{
return proc_modify_flag (pi, PR_RLC, FLAG_RESET);
}
/* Reset inherit_on_fork flag. If the process forks a child while we
are registered for events in the parent, then we will NOT recieve
events from the child. Returns non-zero for success, zero for
failure. */
static int
proc_unset_inherit_on_fork (procinfo *pi)
{
return proc_modify_flag (pi, PR_FORK, FLAG_RESET);
}
#ifdef PR_ASYNC
/* Set PR_ASYNC flag. If one LWP stops because of a debug event
(signal etc.), the remaining LWPs will continue to run. Returns
non-zero for success, zero for failure. */
static int
proc_set_async (procinfo *pi)
{
return proc_modify_flag (pi, PR_ASYNC, FLAG_SET);
}
/* Reset PR_ASYNC flag. If one LWP stops because of a debug event
(signal etc.), then all other LWPs will stop as well. Returns
non-zero for success, zero for failure. */
static int
proc_unset_async (procinfo *pi)
{
return proc_modify_flag (pi, PR_ASYNC, FLAG_RESET);
}
#endif /* PR_ASYNC */
/* Request the process/LWP to stop. Does not wait. Returns non-zero
for success, zero for failure. */
static int
proc_stop_process (procinfo *pi)
{
int win;
/* We might conceivably apply this operation to an LWP, and the
LWP's ctl file descriptor might not be open. */
if (pi->ctl_fd == 0 &&
open_procinfo_files (pi, FD_CTL) == 0)
return 0;
else
{
#ifdef NEW_PROC_API
procfs_ctl_t cmd = PCSTOP;
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
#else /* ioctl method */
win = (ioctl (pi->ctl_fd, PIOCSTOP, &pi->prstatus) >= 0);
/* Note: the call also reads the prstatus. */
if (win)
{
pi->status_valid = 1;
PROC_PRETTYFPRINT_STATUS (proc_flags (pi),
proc_why (pi),
proc_what (pi),
proc_get_current_thread (pi));
}
#endif
}
return win;
}
/* Wait for the process or LWP to stop (block until it does). Returns
non-zero for success, zero for failure. */
static int
proc_wait_for_stop (procinfo *pi)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
procfs_ctl_t cmd = PCWSTOP;
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
/* We been runnin' and we stopped -- need to update status. */
pi->status_valid = 0;
}
#else /* ioctl method */
win = (ioctl (pi->ctl_fd, PIOCWSTOP, &pi->prstatus) >= 0);
/* Above call also refreshes the prstatus. */
if (win)
{
pi->status_valid = 1;
PROC_PRETTYFPRINT_STATUS (proc_flags (pi),
proc_why (pi),
proc_what (pi),
proc_get_current_thread (pi));
}
#endif
return win;
}
/* Make the process or LWP runnable.
Options (not all are implemented):
- single-step
- clear current fault
- clear current signal
- abort the current system call
- stop as soon as finished with system call
- (ioctl): set traced signal set
- (ioctl): set held signal set
- (ioctl): set traced fault set
- (ioctl): set start pc (vaddr)
Always clears the current fault. PI is the process or LWP to
operate on. If STEP is true, set the process or LWP to trap after
one instruction. If SIGNO is zero, clear the current signal if
any; if non-zero, set the current signal to this one. Returns
non-zero for success, zero for failure. */
static int
proc_run_process (procinfo *pi, int step, int signo)
{
int win;
int runflags;
/* We will probably have to apply this operation to individual
threads, so make sure the control file descriptor is open. */
if (pi->ctl_fd == 0 &&
open_procinfo_files (pi, FD_CTL) == 0)
{
return 0;
}
runflags = PRCFAULT; /* Always clear current fault. */
if (step)
runflags |= PRSTEP;
if (signo == 0)
runflags |= PRCSIG;
else if (signo != -1) /* -1 means do nothing W.R.T. signals. */
proc_set_current_signal (pi, signo);
#ifdef NEW_PROC_API
{
procfs_ctl_t cmd[2];
cmd[0] = PCRUN;
cmd[1] = runflags;
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
}
#else /* ioctl method */
{
prrun_t prrun;
memset (&prrun, 0, sizeof (prrun));
prrun.pr_flags = runflags;
win = (ioctl (pi->ctl_fd, PIOCRUN, &prrun) >= 0);
}
#endif
return win;
}
/* Register to trace signals in the process or LWP. Returns non-zero
for success, zero for failure. */
static int
proc_set_traced_signals (procinfo *pi, gdb_sigset_t *sigset)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
struct {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char sigset[sizeof (gdb_sigset_t)];
} arg;
arg.cmd = PCSTRACE;
memcpy (&arg.sigset, sigset, sizeof (gdb_sigset_t));
win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
}
#else /* ioctl method */
win = (ioctl (pi->ctl_fd, PIOCSTRACE, sigset) >= 0);
#endif
/* The above operation renders the procinfo's cached pstatus obsolete. */
pi->status_valid = 0;
if (!win)
warning (_("procfs: set_traced_signals failed"));
return win;
}
/* Register to trace hardware faults in the process or LWP. Returns
non-zero for success, zero for failure. */
static int
proc_set_traced_faults (procinfo *pi, fltset_t *fltset)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
struct {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char fltset[sizeof (fltset_t)];
} arg;
arg.cmd = PCSFAULT;
memcpy (&arg.fltset, fltset, sizeof (fltset_t));
win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
}
#else /* ioctl method */
win = (ioctl (pi->ctl_fd, PIOCSFAULT, fltset) >= 0);
#endif
/* The above operation renders the procinfo's cached pstatus obsolete. */
pi->status_valid = 0;
return win;
}
/* Register to trace entry to system calls in the process or LWP.
Returns non-zero for success, zero for failure. */
static int
proc_set_traced_sysentry (procinfo *pi, sysset_t *sysset)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
struct gdb_proc_ctl_pcsentry {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char sysset[sizeof (sysset_t)];
} *argp;
int argp_size = sizeof (struct gdb_proc_ctl_pcsentry)
- sizeof (sysset_t)
+ sysset_t_size (pi);
argp = xmalloc (argp_size);
argp->cmd = PCSENTRY;
memcpy (&argp->sysset, sysset, sysset_t_size (pi));
win = (write (pi->ctl_fd, (char *) argp, argp_size) == argp_size);
xfree (argp);
}
#else /* ioctl method */
win = (ioctl (pi->ctl_fd, PIOCSENTRY, sysset) >= 0);
#endif
/* The above operation renders the procinfo's cached pstatus
obsolete. */
pi->status_valid = 0;
return win;
}
/* Register to trace exit from system calls in the process or LWP.
Returns non-zero for success, zero for failure. */
static int
proc_set_traced_sysexit (procinfo *pi, sysset_t *sysset)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
struct gdb_proc_ctl_pcsexit {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char sysset[sizeof (sysset_t)];
} *argp;
int argp_size = sizeof (struct gdb_proc_ctl_pcsexit)
- sizeof (sysset_t)
+ sysset_t_size (pi);
argp = xmalloc (argp_size);
argp->cmd = PCSEXIT;
memcpy (&argp->sysset, sysset, sysset_t_size (pi));
win = (write (pi->ctl_fd, (char *) argp, argp_size) == argp_size);
xfree (argp);
}
#else /* ioctl method */
win = (ioctl (pi->ctl_fd, PIOCSEXIT, sysset) >= 0);
#endif
/* The above operation renders the procinfo's cached pstatus
obsolete. */
pi->status_valid = 0;
return win;
}
/* Specify the set of blocked / held signals in the process or LWP.
Returns non-zero for success, zero for failure. */
static int
proc_set_held_signals (procinfo *pi, gdb_sigset_t *sighold)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
struct {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char hold[sizeof (gdb_sigset_t)];
} arg;
arg.cmd = PCSHOLD;
memcpy (&arg.hold, sighold, sizeof (gdb_sigset_t));
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
}
#else
win = (ioctl (pi->ctl_fd, PIOCSHOLD, sighold) >= 0);
#endif
/* The above operation renders the procinfo's cached pstatus
obsolete. */
pi->status_valid = 0;
return win;
}
/* Returns the set of signals that are held / blocked. Will also copy
the sigset if SAVE is non-zero. */
static gdb_sigset_t *
proc_get_held_signals (procinfo *pi, gdb_sigset_t *save)
{
gdb_sigset_t *ret = NULL;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
if (!pi->status_valid)
if (!proc_get_status (pi))
return NULL;
ret = &pi->prstatus.pr_lwp.pr_lwphold;
#else /* not NEW_PROC_API */
{
static gdb_sigset_t sigheld;
if (ioctl (pi->ctl_fd, PIOCGHOLD, &sigheld) >= 0)
ret = &sigheld;
}
#endif /* NEW_PROC_API */
if (save && ret)
memcpy (save, ret, sizeof (gdb_sigset_t));
return ret;
}
/* Returns the set of signals that are traced / debugged. Will also
copy the sigset if SAVE is non-zero. */
static gdb_sigset_t *
proc_get_traced_signals (procinfo *pi, gdb_sigset_t *save)
{
gdb_sigset_t *ret = NULL;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
if (!pi->status_valid)
if (!proc_get_status (pi))
return NULL;
ret = &pi->prstatus.pr_sigtrace;
#else
{
static gdb_sigset_t sigtrace;
if (ioctl (pi->ctl_fd, PIOCGTRACE, &sigtrace) >= 0)
ret = &sigtrace;
}
#endif
if (save && ret)
memcpy (save, ret, sizeof (gdb_sigset_t));
return ret;
}
/* Returns the set of hardware faults that are traced /debugged. Will
also copy the faultset if SAVE is non-zero. */
static fltset_t *
proc_get_traced_faults (procinfo *pi, fltset_t *save)
{
fltset_t *ret = NULL;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
if (!pi->status_valid)
if (!proc_get_status (pi))
return NULL;
ret = &pi->prstatus.pr_flttrace;
#else
{
static fltset_t flttrace;
if (ioctl (pi->ctl_fd, PIOCGFAULT, &flttrace) >= 0)
ret = &flttrace;
}
#endif
if (save && ret)
memcpy (save, ret, sizeof (fltset_t));
return ret;
}
/* Returns the set of syscalls that are traced /debugged on entry.
Will also copy the syscall set if SAVE is non-zero. */
static sysset_t *
proc_get_traced_sysentry (procinfo *pi, sysset_t *save)
{
sysset_t *ret = NULL;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
if (!pi->status_valid)
if (!proc_get_status (pi))
return NULL;
#ifndef DYNAMIC_SYSCALLS
ret = &pi->prstatus.pr_sysentry;
#else /* DYNAMIC_SYSCALLS */
{
static sysset_t *sysentry;
size_t size;
if (!sysentry)
sysentry = sysset_t_alloc (pi);
ret = sysentry;
if (pi->status_fd == 0 && open_procinfo_files (pi, FD_STATUS) == 0)
return NULL;
if (pi->prstatus.pr_sysentry_offset == 0)
{
gdb_premptysysset (sysentry);
}
else
{
int rsize;
if (lseek (pi->status_fd, (off_t) pi->prstatus.pr_sysentry_offset,
SEEK_SET)
!= (off_t) pi->prstatus.pr_sysentry_offset)
return NULL;
size = sysset_t_size (pi);
gdb_premptysysset (sysentry);
rsize = read (pi->status_fd, sysentry, size);
if (rsize < 0)
return NULL;
}
}
#endif /* DYNAMIC_SYSCALLS */
#else /* !NEW_PROC_API */
{
static sysset_t sysentry;
if (ioctl (pi->ctl_fd, PIOCGENTRY, &sysentry) >= 0)
ret = &sysentry;
}
#endif /* NEW_PROC_API */
if (save && ret)
memcpy (save, ret, sysset_t_size (pi));
return ret;
}
/* Returns the set of syscalls that are traced /debugged on exit.
Will also copy the syscall set if SAVE is non-zero. */
static sysset_t *
proc_get_traced_sysexit (procinfo *pi, sysset_t *save)
{
sysset_t * ret = NULL;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
if (!pi->status_valid)
if (!proc_get_status (pi))
return NULL;
#ifndef DYNAMIC_SYSCALLS
ret = &pi->prstatus.pr_sysexit;
#else /* DYNAMIC_SYSCALLS */
{
static sysset_t *sysexit;
size_t size;
if (!sysexit)
sysexit = sysset_t_alloc (pi);
ret = sysexit;
if (pi->status_fd == 0 && open_procinfo_files (pi, FD_STATUS) == 0)
return NULL;
if (pi->prstatus.pr_sysexit_offset == 0)
{
gdb_premptysysset (sysexit);
}
else
{
int rsize;
if (lseek (pi->status_fd, (off_t) pi->prstatus.pr_sysexit_offset,
SEEK_SET)
!= (off_t) pi->prstatus.pr_sysexit_offset)
return NULL;
size = sysset_t_size (pi);
gdb_premptysysset (sysexit);
rsize = read (pi->status_fd, sysexit, size);
if (rsize < 0)
return NULL;
}
}
#endif /* DYNAMIC_SYSCALLS */
#else
{
static sysset_t sysexit;
if (ioctl (pi->ctl_fd, PIOCGEXIT, &sysexit) >= 0)
ret = &sysexit;
}
#endif
if (save && ret)
memcpy (save, ret, sysset_t_size (pi));
return ret;
}
/* The current fault (if any) is cleared; the associated signal will
not be sent to the process or LWP when it resumes. Returns
non-zero for success, zero for failure. */
static int
proc_clear_current_fault (procinfo *pi)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
procfs_ctl_t cmd = PCCFAULT;
win = (write (pi->ctl_fd, (void *) &cmd, sizeof (cmd)) == sizeof (cmd));
}
#else
win = (ioctl (pi->ctl_fd, PIOCCFAULT, 0) >= 0);
#endif
return win;
}
/* Set the "current signal" that will be delivered next to the
process. NOTE: semantics are different from those of KILL. This
signal will be delivered to the process or LWP immediately when it
is resumed (even if the signal is held/blocked); it will NOT
immediately cause another event of interest, and will NOT first
trap back to the debugger. Returns non-zero for success, zero for
failure. */
static int
proc_set_current_signal (procinfo *pi, int signo)
{
int win;
struct {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char sinfo[sizeof (gdb_siginfo_t)];
} arg;
gdb_siginfo_t mysinfo;
ptid_t wait_ptid;
struct target_waitstatus wait_status;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef PROCFS_DONT_PIOCSSIG_CURSIG
/* With Alpha OSF/1 procfs, the kernel gets really confused if it
receives a PIOCSSIG with a signal identical to the current
signal, it messes up the current signal. Work around the kernel
bug. */
if (signo > 0 &&
signo == proc_cursig (pi))
return 1; /* I assume this is a success? */
#endif
/* The pointer is just a type alias. */
get_last_target_status (&wait_ptid, &wait_status);
if (ptid_equal (wait_ptid, inferior_ptid)
&& wait_status.kind == TARGET_WAITKIND_STOPPED
&& wait_status.value.sig == gdb_signal_from_host (signo)
&& proc_get_status (pi)
#ifdef NEW_PROC_API
&& pi->prstatus.pr_lwp.pr_info.si_signo == signo
#else
&& pi->prstatus.pr_info.si_signo == signo
#endif
)
/* Use the siginfo associated with the signal being
redelivered. */
#ifdef NEW_PROC_API
memcpy (arg.sinfo, &pi->prstatus.pr_lwp.pr_info, sizeof (gdb_siginfo_t));
#else
memcpy (arg.sinfo, &pi->prstatus.pr_info, sizeof (gdb_siginfo_t));
#endif
else
{
mysinfo.si_signo = signo;
mysinfo.si_code = 0;
mysinfo.si_pid = getpid (); /* ?why? */
mysinfo.si_uid = getuid (); /* ?why? */
memcpy (arg.sinfo, &mysinfo, sizeof (gdb_siginfo_t));
}
#ifdef NEW_PROC_API
arg.cmd = PCSSIG;
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
#else
win = (ioctl (pi->ctl_fd, PIOCSSIG, (void *) &arg.sinfo) >= 0);
#endif
return win;
}
/* The current signal (if any) is cleared, and is not sent to the
process or LWP when it resumes. Returns non-zero for success, zero
for failure. */
static int
proc_clear_current_signal (procinfo *pi)
{
int win;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
#ifdef NEW_PROC_API
{
struct {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char sinfo[sizeof (gdb_siginfo_t)];
} arg;
gdb_siginfo_t mysinfo;
arg.cmd = PCSSIG;
/* The pointer is just a type alias. */
mysinfo.si_signo = 0;
mysinfo.si_code = 0;
mysinfo.si_errno = 0;
mysinfo.si_pid = getpid (); /* ?why? */
mysinfo.si_uid = getuid (); /* ?why? */
memcpy (arg.sinfo, &mysinfo, sizeof (gdb_siginfo_t));
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
}
#else
win = (ioctl (pi->ctl_fd, PIOCSSIG, 0) >= 0);
#endif
return win;
}
/* Return the general-purpose registers for the process or LWP
corresponding to PI. Upon failure, return NULL. */
static gdb_gregset_t *
proc_get_gregs (procinfo *pi)
{
if (!pi->status_valid || !pi->gregs_valid)
if (!proc_get_status (pi))
return NULL;
#ifdef NEW_PROC_API
return &pi->prstatus.pr_lwp.pr_reg;
#else
return &pi->prstatus.pr_reg;
#endif
}
/* Return the general-purpose registers for the process or LWP
corresponding to PI. Upon failure, return NULL. */
static gdb_fpregset_t *
proc_get_fpregs (procinfo *pi)
{
#ifdef NEW_PROC_API
if (!pi->status_valid || !pi->fpregs_valid)
if (!proc_get_status (pi))
return NULL;
return &pi->prstatus.pr_lwp.pr_fpreg;
#else /* not NEW_PROC_API */
if (pi->fpregs_valid)
return &pi->fpregset; /* Already got 'em. */
else
{
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
{
return NULL;
}
else
{
# ifdef PIOCTGFPREG
struct {
long pr_count;
tid_t pr_error_thread;
tfpregset_t thread_1;
} thread_fpregs;
thread_fpregs.pr_count = 1;
thread_fpregs.thread_1.tid = pi->tid;
if (pi->tid == 0
&& ioctl (pi->ctl_fd, PIOCGFPREG, &pi->fpregset) >= 0)
{
pi->fpregs_valid = 1;
return &pi->fpregset; /* Got 'em now! */
}
else if (pi->tid != 0
&& ioctl (pi->ctl_fd, PIOCTGFPREG, &thread_fpregs) >= 0)
{
memcpy (&pi->fpregset, &thread_fpregs.thread_1.pr_fpregs,
sizeof (pi->fpregset));
pi->fpregs_valid = 1;
return &pi->fpregset; /* Got 'em now! */
}
else
{
return NULL;
}
# else
if (ioctl (pi->ctl_fd, PIOCGFPREG, &pi->fpregset) >= 0)
{
pi->fpregs_valid = 1;
return &pi->fpregset; /* Got 'em now! */
}
else
{
return NULL;
}
# endif
}
}
#endif /* NEW_PROC_API */
}
/* Write the general-purpose registers back to the process or LWP
corresponding to PI. Return non-zero for success, zero for
failure. */
static int
proc_set_gregs (procinfo *pi)
{
gdb_gregset_t *gregs;
int win;
gregs = proc_get_gregs (pi);
if (gregs == NULL)
return 0; /* proc_get_regs has already warned. */
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
{
return 0;
}
else
{
#ifdef NEW_PROC_API
struct {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char gregs[sizeof (gdb_gregset_t)];
} arg;
arg.cmd = PCSREG;
memcpy (&arg.gregs, gregs, sizeof (arg.gregs));
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
#else
win = (ioctl (pi->ctl_fd, PIOCSREG, gregs) >= 0);
#endif
}
/* Policy: writing the registers invalidates our cache. */
pi->gregs_valid = 0;
return win;
}
/* Write the floating-pointer registers back to the process or LWP
corresponding to PI. Return non-zero for success, zero for
failure. */
static int
proc_set_fpregs (procinfo *pi)
{
gdb_fpregset_t *fpregs;
int win;
fpregs = proc_get_fpregs (pi);
if (fpregs == NULL)
return 0; /* proc_get_fpregs has already warned. */
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
{
return 0;
}
else
{
#ifdef NEW_PROC_API
struct {
procfs_ctl_t cmd;
/* Use char array to avoid alignment issues. */
char fpregs[sizeof (gdb_fpregset_t)];
} arg;
arg.cmd = PCSFPREG;
memcpy (&arg.fpregs, fpregs, sizeof (arg.fpregs));
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
#else
# ifdef PIOCTSFPREG
if (pi->tid == 0)
win = (ioctl (pi->ctl_fd, PIOCSFPREG, fpregs) >= 0);
else
{
struct {
long pr_count;
tid_t pr_error_thread;
tfpregset_t thread_1;
} thread_fpregs;
thread_fpregs.pr_count = 1;
thread_fpregs.thread_1.tid = pi->tid;
memcpy (&thread_fpregs.thread_1.pr_fpregs, fpregs,
sizeof (*fpregs));
win = (ioctl (pi->ctl_fd, PIOCTSFPREG, &thread_fpregs) >= 0);
}
# else
win = (ioctl (pi->ctl_fd, PIOCSFPREG, fpregs) >= 0);
# endif
#endif /* NEW_PROC_API */
}
/* Policy: writing the registers invalidates our cache. */
pi->fpregs_valid = 0;
return win;
}
/* Send a signal to the proc or lwp with the semantics of "kill()".
Returns non-zero for success, zero for failure. */
static int
proc_kill (procinfo *pi, int signo)
{
int win;
/* We might conceivably apply this operation to an LWP, and the
LWP's ctl file descriptor might not be open. */
if (pi->ctl_fd == 0 &&
open_procinfo_files (pi, FD_CTL) == 0)
{
return 0;
}
else
{
#ifdef NEW_PROC_API
procfs_ctl_t cmd[2];
cmd[0] = PCKILL;
cmd[1] = signo;
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
#else /* ioctl method */
/* FIXME: do I need the Alpha OSF fixups present in
procfs.c/unconditionally_kill_inferior? Perhaps only for SIGKILL? */
win = (ioctl (pi->ctl_fd, PIOCKILL, &signo) >= 0);
#endif
}
return win;
}
/* Find the pid of the process that started this one. Returns the
parent process pid, or zero. */
static int
proc_parent_pid (procinfo *pi)
{
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0;
return pi->prstatus.pr_ppid;
}
/* Convert a target address (a.k.a. CORE_ADDR) into a host address
(a.k.a void pointer)! */
#if (defined (PCWATCH) || defined (PIOCSWATCH)) \
&& !(defined (PIOCOPENLWP))
static void *
procfs_address_to_host_pointer (CORE_ADDR addr)
{
struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
void *ptr;
gdb_assert (sizeof (ptr) == TYPE_LENGTH (ptr_type));
gdbarch_address_to_pointer (target_gdbarch (), ptr_type,
(gdb_byte *) &ptr, addr);
return ptr;
}
#endif
static int
proc_set_watchpoint (procinfo *pi, CORE_ADDR addr, int len, int wflags)
{
#if !defined (PCWATCH) && !defined (PIOCSWATCH)
/* If neither or these is defined, we can't support watchpoints.
This just avoids possibly failing to compile the below on such
systems. */
return 0;
#else
/* Horrible hack! Detect Solaris 2.5, because this doesn't work on 2.5. */
#if defined (PIOCOPENLWP) /* Solaris 2.5: bail out. */
return 0;
#else
struct {
procfs_ctl_t cmd;
char watch[sizeof (prwatch_t)];
} arg;
prwatch_t pwatch;
/* NOTE: cagney/2003-02-01: Even more horrible hack. Need to
convert a target address into something that can be stored in a
native data structure. */
#ifdef PCAGENT /* Horrible hack: only defined on Solaris 2.6+ */
pwatch.pr_vaddr = (uintptr_t) procfs_address_to_host_pointer (addr);
#else
pwatch.pr_vaddr = (caddr_t) procfs_address_to_host_pointer (addr);
#endif
pwatch.pr_size = len;
pwatch.pr_wflags = wflags;
#if defined(NEW_PROC_API) && defined (PCWATCH)
arg.cmd = PCWATCH;
memcpy (arg.watch, &pwatch, sizeof (prwatch_t));
return (write (pi->ctl_fd, &arg, sizeof (arg)) == sizeof (arg));
#else
#if defined (PIOCSWATCH)
return (ioctl (pi->ctl_fd, PIOCSWATCH, &pwatch) >= 0);
#else
return 0; /* Fail */
#endif
#endif
#endif
#endif
}
#if (defined(__i386__) || defined(__x86_64__)) && defined (sun)
#include <sys/sysi86.h>
/* The KEY is actually the value of the lower 16 bits of the GS
register for the LWP that we're interested in. Returns the
matching ssh struct (LDT entry). */
static struct ssd *
proc_get_LDT_entry (procinfo *pi, int key)
{
static struct ssd *ldt_entry = NULL;
#ifdef NEW_PROC_API
char pathname[MAX_PROC_NAME_SIZE];
struct cleanup *old_chain = NULL;
int fd;
/* Allocate space for one LDT entry.
This alloc must persist, because we return a pointer to it. */
if (ldt_entry == NULL)
ldt_entry = XNEW (struct ssd);
/* Open the file descriptor for the LDT table. */
sprintf (pathname, "/proc/%d/ldt", pi->pid);
if ((fd = open_with_retry (pathname, O_RDONLY)) < 0)
{
proc_warn (pi, "proc_get_LDT_entry (open)", __LINE__);
return NULL;
}
/* Make sure it gets closed again! */
old_chain = make_cleanup_close (fd);
/* Now 'read' thru the table, find a match and return it. */
while (read (fd, ldt_entry, sizeof (struct ssd)) == sizeof (struct ssd))
{
if (ldt_entry->sel == 0 &&
ldt_entry->bo == 0 &&
ldt_entry->acc1 == 0 &&
ldt_entry->acc2 == 0)
break; /* end of table */
/* If key matches, return this entry. */
if (ldt_entry->sel == key)
return ldt_entry;
}
/* Loop ended, match not found. */
return NULL;
#else
int nldt, i;
static int nalloc = 0;
/* Get the number of LDT entries. */
if (ioctl (pi->ctl_fd, PIOCNLDT, &nldt) < 0)
{
proc_warn (pi, "proc_get_LDT_entry (PIOCNLDT)", __LINE__);
return NULL;
}
/* Allocate space for the number of LDT entries. */
/* This alloc has to persist, 'cause we return a pointer to it. */
if (nldt > nalloc)
{
ldt_entry = (struct ssd *)
xrealloc (ldt_entry, (nldt + 1) * sizeof (struct ssd));
nalloc = nldt;
}
/* Read the whole table in one gulp. */
if (ioctl (pi->ctl_fd, PIOCLDT, ldt_entry) < 0)
{
proc_warn (pi, "proc_get_LDT_entry (PIOCLDT)", __LINE__);
return NULL;
}
/* Search the table and return the (first) entry matching 'key'. */
for (i = 0; i < nldt; i++)
if (ldt_entry[i].sel == key)
return &ldt_entry[i];
/* Loop ended, match not found. */
return NULL;
#endif
}
/* Returns the pointer to the LDT entry of PTID. */
struct ssd *
procfs_find_LDT_entry (ptid_t ptid)
{
gdb_gregset_t *gregs;
int key;
procinfo *pi;
/* Find procinfo for the lwp. */
if ((pi = find_procinfo (ptid_get_pid (ptid), ptid_get_lwp (ptid))) == NULL)
{
warning (_("procfs_find_LDT_entry: could not find procinfo for %d:%ld."),
ptid_get_pid (ptid), ptid_get_lwp (ptid));
return NULL;
}
/* get its general registers. */
if ((gregs = proc_get_gregs (pi)) == NULL)
{
warning (_("procfs_find_LDT_entry: could not read gregs for %d:%ld."),
ptid_get_pid (ptid), ptid_get_lwp (ptid));
return NULL;
}
/* Now extract the GS register's lower 16 bits. */
key = (*gregs)[GS] & 0xffff;
/* Find the matching entry and return it. */
return proc_get_LDT_entry (pi, key);
}
#endif
/* =============== END, non-thread part of /proc "MODULE" =============== */
/* =================== Thread "MODULE" =================== */
/* NOTE: you'll see more ifdefs and duplication of functions here,
since there is a different way to do threads on every OS. */
/* Returns the number of threads for the process. */
#if defined (PIOCNTHR) && defined (PIOCTLIST)
/* OSF version */
static int
proc_get_nthreads (procinfo *pi)
{
int nthreads = 0;
if (ioctl (pi->ctl_fd, PIOCNTHR, &nthreads) < 0)
proc_warn (pi, "procfs: PIOCNTHR failed", __LINE__);
return nthreads;
}
#else
#if defined (SYS_lwpcreate) || defined (SYS_lwp_create) /* FIXME: multiple */
/* Solaris version */
static int
proc_get_nthreads (procinfo *pi)
{
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0;
/* NEW_PROC_API: only works for the process procinfo, because the
LWP procinfos do not get prstatus filled in. */
#ifdef NEW_PROC_API
if (pi->tid != 0) /* Find the parent process procinfo. */
pi = find_procinfo_or_die (pi->pid, 0);
#endif
return pi->prstatus.pr_nlwp;
}
#else
/* Default version */
static int
proc_get_nthreads (procinfo *pi)
{
return 0;
}
#endif
#endif
/* LWP version.
Return the ID of the thread that had an event of interest.
(ie. the one that hit a breakpoint or other traced event). All
other things being equal, this should be the ID of a thread that is
currently executing. */
#if defined (SYS_lwpcreate) || defined (SYS_lwp_create) /* FIXME: multiple */
/* Solaris version */
static int
proc_get_current_thread (procinfo *pi)
{
/* Note: this should be applied to the root procinfo for the
process, not to the procinfo for an LWP. If applied to the
procinfo for an LWP, it will simply return that LWP's ID. In
that case, find the parent process procinfo. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
if (!pi->status_valid)
if (!proc_get_status (pi))
return 0;
#ifdef NEW_PROC_API
return pi->prstatus.pr_lwp.pr_lwpid;
#else
return pi->prstatus.pr_who;
#endif
}
#else
#if defined (PIOCNTHR) && defined (PIOCTLIST)
/* OSF version */
static int
proc_get_current_thread (procinfo *pi)
{
#if 0 /* FIXME: not ready for prime time? */
return pi->prstatus.pr_tid;
#else
return 0;
#endif
}
#else
/* Default version */
static int
proc_get_current_thread (procinfo *pi)
{
return 0;
}
#endif
#endif
/* Discover the IDs of all the threads within the process, and create
a procinfo for each of them (chained to the parent). This
unfortunately requires a different method on every OS. Returns
non-zero for success, zero for failure. */
static int
proc_delete_dead_threads (procinfo *parent, procinfo *thread, void *ignore)
{
if (thread && parent) /* sanity */
{
thread->status_valid = 0;
if (!proc_get_status (thread))
destroy_one_procinfo (&parent->thread_list, thread);
}
return 0; /* keep iterating */
}
#if defined (PIOCLSTATUS)
/* Solaris 2.5 (ioctl) version */
static int
proc_update_threads (procinfo *pi)
{
gdb_prstatus_t *prstatus;
struct cleanup *old_chain = NULL;
procinfo *thread;
int nlwp, i;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL);
if ((nlwp = proc_get_nthreads (pi)) <= 1)
return 1; /* Process is not multi-threaded; nothing to do. */
prstatus = XNEWVEC (gdb_prstatus_t, nlwp + 1);
old_chain = make_cleanup (xfree, prstatus);
if (ioctl (pi->ctl_fd, PIOCLSTATUS, prstatus) < 0)
proc_error (pi, "update_threads (PIOCLSTATUS)", __LINE__);
/* Skip element zero, which represents the process as a whole. */
for (i = 1; i < nlwp + 1; i++)
{
if ((thread = create_procinfo (pi->pid, prstatus[i].pr_who)) == NULL)
proc_error (pi, "update_threads, create_procinfo", __LINE__);
memcpy (&thread->prstatus, &prstatus[i], sizeof (*prstatus));
thread->status_valid = 1;
}
pi->threads_valid = 1;
do_cleanups (old_chain);
return 1;
}
#else
#ifdef NEW_PROC_API
/* Solaris 6 (and later) version. */
static void
do_closedir_cleanup (void *dir)
{
closedir (dir);
}
static int
proc_update_threads (procinfo *pi)
{
char pathname[MAX_PROC_NAME_SIZE + 16];
struct dirent *direntry;
struct cleanup *old_chain = NULL;
procinfo *thread;
DIR *dirp;
int lwpid;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL);
/* Note: this brute-force method was originally devised for Unixware
(support removed since), and will also work on Solaris 2.6 and
2.7. The original comment mentioned the existence of a much
simpler and more elegant way to do this on Solaris, but didn't
point out what that was. */
strcpy (pathname, pi->pathname);
strcat (pathname, "/lwp");
if ((dirp = opendir (pathname)) == NULL)
proc_error (pi, "update_threads, opendir", __LINE__);
old_chain = make_cleanup (do_closedir_cleanup, dirp);
while ((direntry = readdir (dirp)) != NULL)
if (direntry->d_name[0] != '.') /* skip '.' and '..' */
{
lwpid = atoi (&direntry->d_name[0]);
if ((thread = create_procinfo (pi->pid, lwpid)) == NULL)
proc_error (pi, "update_threads, create_procinfo", __LINE__);
}
pi->threads_valid = 1;
do_cleanups (old_chain);
return 1;
}
#else
#ifdef PIOCTLIST
/* OSF version */
static int
proc_update_threads (procinfo *pi)
{
int nthreads, i;
tid_t *threads;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL);
nthreads = proc_get_nthreads (pi);
if (nthreads < 2)
return 0; /* Nothing to do for 1 or fewer threads. */
threads = XNEWVEC (tid_t, nthreads);
if (ioctl (pi->ctl_fd, PIOCTLIST, threads) < 0)
proc_error (pi, "procfs: update_threads (PIOCTLIST)", __LINE__);
for (i = 0; i < nthreads; i++)
{
if (!find_procinfo (pi->pid, threads[i]))
if (!create_procinfo (pi->pid, threads[i]))
proc_error (pi, "update_threads, create_procinfo", __LINE__);
}
pi->threads_valid = 1;
return 1;
}
#else
/* Default version */
static int
proc_update_threads (procinfo *pi)
{
return 0;
}
#endif /* OSF PIOCTLIST */
#endif /* NEW_PROC_API */
#endif /* SOL 2.5 PIOCLSTATUS */
/* Given a pointer to a function, call that function once for each lwp
in the procinfo list, until the function returns non-zero, in which
event return the value returned by the function.
Note: this function does NOT call update_threads. If you want to
discover new threads first, you must call that function explicitly.
This function just makes a quick pass over the currently-known
procinfos.
PI is the parent process procinfo. FUNC is the per-thread
function. PTR is an opaque parameter for function. Returns the
first non-zero return value from the callee, or zero. */
static int
proc_iterate_over_threads (procinfo *pi,
int (*func) (procinfo *, procinfo *, void *),
void *ptr)
{
procinfo *thread, *next;
int retval = 0;
/* We should never have to apply this operation to any procinfo
except the one for the main process. If that ever changes for
any reason, then take out the following clause and replace it
with one that makes sure the ctl_fd is open. */
if (pi->tid != 0)
pi = find_procinfo_or_die (pi->pid, 0);
for (thread = pi->thread_list; thread != NULL; thread = next)
{
next = thread->next; /* In case thread is destroyed. */
if ((retval = (*func) (pi, thread, ptr)) != 0)
break;
}
return retval;
}
/* =================== END, Thread "MODULE" =================== */
/* =================== END, /proc "MODULE" =================== */
/* =================== GDB "MODULE" =================== */
/* Here are all of the gdb target vector functions and their
friends. */
static ptid_t do_attach (ptid_t ptid);
static void do_detach (int signo);
static void proc_trace_syscalls_1 (procinfo *pi, int syscallnum,
int entry_or_exit, int mode, int from_tty);
/* Sets up the inferior to be debugged. Registers to trace signals,
hardware faults, and syscalls. Note: does not set RLC flag: caller
may want to customize that. Returns zero for success (note!
unlike most functions in this module); on failure, returns the LINE
NUMBER where it failed! */
static int
procfs_debug_inferior (procinfo *pi)
{
fltset_t traced_faults;
gdb_sigset_t traced_signals;
sysset_t *traced_syscall_entries;
sysset_t *traced_syscall_exits;
int status;
/* Register to trace hardware faults in the child. */
prfillset (&traced_faults); /* trace all faults... */
gdb_prdelset (&traced_faults, FLTPAGE); /* except page fault. */
if (!proc_set_traced_faults (pi, &traced_faults))
return __LINE__;
/* Initially, register to trace all signals in the child. */
prfillset (&traced_signals);